Question

the angle between vector a = i + j and b = i + j is?​

Answer 1

Answer:

The angle between the vectors is 0°. the are parallel vectors.

Answer 2

Answer:

π/3.

Explanation:

Let the two vectors to be vector A = i + j and the vector B = i+j. So, we get that the two vectors are equal. We know the formulae that A.B = |A|.|B|cosx where x is the angle between the vector A and B.

So, on solving we will have cosx = A.B/|A|.|B|. Now, the value of A.B will be (1,1,0).(1,1,0) which will be equal to 1. And the  |A| = √2 and |B| will be √2. So, the value of cosx = 1/2 which will be equal to x = π/3.